Creating a Measure To Return Summarized Values Based on Report Parameters/Slicers

Here's the code for all the measures I created...

Delay Count = DISTINCTCOUNT(Delays[ID])

Total Delay (Hours) = 
    SUMX(
		Delays,
		DATEDIFF(
			[Delay Start],
			[Delay End],
			HOUR
		)
	)

Severity = 
VAR	DelayCount = [Delay Count]
VAR	DelayDuration = [Total Delay (Hours)]
RETURN

SWITCH(
	TRUE(),
	AND(
		DelayCount > 'Delay Count'[Delay Count Value],
		DelayDuration > 'Delay Duration'[Delay Duration Value]
	),
	"Catastrophic",
	AND(
		DelayCount > 'Delay Count'[Delay Count Value],
		DelayDuration > 'Delay Duration'[Delay Duration Value]
	),
	"Severe",
	"Normal"
)

[Delay Count] is just the distinct count of Delay ID.  [Delay Count Value] and [Delay Duration Value] are the what if parameters that the user could set.  You could drop Description into the rows for a matrix and [Delay Count] and {Total Delay (Hours)] in as values and they would calculate based on the filter context.